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Best Alternatives to CUS10S30

Package: SOD-323Toshiba Semiconductor and StorageDiodes - Rectifiers - SingleDiode Type: SchottkyVoltage - DC Reverse (Vr) (Max): 30 VCurrent - Average Rectified (Io): 1 AForward Voltage (Vf) (Max) @ If: 0.55 V @ 1.0 APeak Forward Surge Current: 9 A

CUS10S30 is a common 30V, 1A Schottky diode in a compact SOD-323 package. Several alternatives exist, including pin-compatible options and functional alternates in different packages that offer upgraded performance.

AI replacement insight

Electrical riskmedium

Vf and Vr differences require verification for efficiency and safety margin.

Package riskhigh

Many functional alternatives are in different packages, requiring a PCB redesign.

Firmware risklow

Not applicable for a simple diode.

Can it be replaced directly?

Direct replacement for CUS10S30 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

For a drop-in replacement, use B5819WS which offers a higher voltage margin. If a board redesign is possible, VS-15MQ040NTRPBF offers superior electrical performance.

Main risk

The main risk is selecting a part with a different package (e.g., SMA, SMB) which is not a drop-in replacement. For same-package parts, the key electrical risk is insufficient voltage margin.

Recommended alternatives

3
B5818WS package
B5818WS

Slkor(SLKORMICRO Elec.)

Needs validationmedium risk

A near-identical pin-compatible match in a SOD-323 package with the same key ratings.

View details

Alternative comparison matrix

Feature / factorCUS10S30B5818WSB5819WSVS-15MQ040NTRPBFCompatibility / risk
PackageSOD-323SOD-323SOD-323DO-214AC (SMA)SOD-323 / DO-214AC (SMA) — Package matches, enabling potential drop-in.; B5819WS: Package matches, enabling potential drop-in.; VS-15MQ040NTRPBF: Different package requires PCB layout change.
Voltage30V30V40V40V30V / 40V — Identical voltage rating offers no additional design margin.; B5819WS: Higher reverse voltage provides more design margin.; VS-15MQ040NTRPBF: Higher reverse voltage provides more margin.
Current1.0A1.0A1.0A1.5A1.0A / 1.5A — Average forward current matches.; B5819WS: Average forward current matches.; VS-15MQ040NTRPBF: Higher current rating provides more margin.
Forward Voltage0.55V @ 1A0.55V @ 1A~0.58V @ 1A~0.4V @ 1A0.55V @ 1A / ~0.58V @ 1A / ~0.4V @ 1A — Forward voltage matches target specification.; B5819WS: Slightly higher forward voltage may increase power loss.; VS-15MQ040NTRPBF: Lower forward voltage improves efficiency.

Application & sourcing insights

Questions & answers

Verified drop-in options for CUS10S30 are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.